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It is well known that CO2 can be dissolved easily in imidazolium-based room temperature ionic liquids (RTILs). Because of the high CO2 solubility in RTILs, membranes containing RTILs can separate easily gas mixtures such as CO2/N2 and CO2/CH4. In this study, we prepared poly(vinylidene fluoride)-hexafluoropropyl copolymer (PVDF-HFP) gel membranes with several RTILs and measured permeabilities of several gases. When the anion of ionic liquids was tetrafluoroborate(BF4 - ), both CO2 permeability and selectivities decreased as the carbon number of the cation increased. When the cation of ionic liquids was 1-ethyl-3-methylimidazolium(emim), CO2 permeability of gel membranes containing bis(trifluoro- methane)sulfoneimide(Tf2N - ) anion was double compared to those containing tetrafluoroborate(BF4 - ) anion. However, CO2/N2 and CO2/CH4 selectivities of the Tf2N - case were decreased, whereas the H2 selectivity was almost the same for two cases.

Preparation and Gas Permeability Measurements of PVDF-HFP/Ionic Liquid Gel Membranes